The proper installation of a door knob and latch requires the precise drilling of a pair of large-diameter holes: a 2 1/8-inch hole through the face of the door and a 1-inch hole through the edge of the door for the latch. The easiest way to align and mark the spots for these hole locations is with a printed template, or jig. This jig is taped to the door, then the hole locations are marked through the jig. Once the hole locations are marked, the jig is removed and the holes are drilled.
- Skill level:
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Things you need
- Tape measure
- Combination square
- Printed door jig
- 2 1/8-inch drill bit
- Power drill
- 1-inch drill bit
- Phillips screw bit or screwdriver
Measure up 40 5/16 inches from the bottom along the edge of the door, and make a pencil mark. Place the combination square against the edge of the door, and draw a line perpendicular to the edge of the door through the mark. Extend the square line across the inner face of the door about 3 inches.
Fold the printed paper jig along the fold line. Poke a small pencil hole in the centre of the large hole and one in the small hole of the jig. Place the jig onto the edge of the door, aligning both of the small holes with the pencil lines on the door, and secure it with a few pieces of tape.
Mark the centre of each of the two holes in the jig on the door with a pencil. Remove the jig from the door.
Insert the 2 1/8-inch-diameter bit into your power drill, and drill a hole through the marked location on the face of the door.
Switch out the bit in the drill for a 1-inch drill bit. Drill a hole through the pencil mark in the edge of the door. This hole should intersect with the large hole you drilled in the previous step.
Insert the latch into the 1-inch hole, and align the long edges of the latch plate to be parallel with the edges of the door. Mark the perimeter of the latch plate with a pencil.
Remove the latch, and chisel out a mortise in the edge of the door for the latch plate. The mortise should be just deep enough that the face of the latch plate will be flush with the edge of the door.
Slide the latch into the 1-inch hole again, and position the latch plate within the mortise. Drive the two screws through the holes in the latch plate to secure the latch to the door.
Insert the spindle of the door handle through the latch exposed in the large hole in the door. Position the opposite handle on the other side of the door, and connect the two with the included screws. Rotate the handle to test the action of the door handle and latch.
Close the door, and mark the spot where the door latch meets the door jamb. Position the strike plate over the jamb, and mark the perimeter of the plate onto the jamb. Use a chisel to create a mortise for the strike plate in the jamb, and then install the strike plate with the included screws.
Test the opening and closing of the door to make sure that it latches properly.
Tips and warnings
- When using a power drill, wear a pair of safety glasses to protect your eyes from any possible debris caused by the drilling of the door.
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